论文标题
阈值高于触觉的离子化光谱法的离子连贯性
Ionic Coherence in Resonant Above-Threshold Attosecond Ionization Spectroscopy
论文作者
论文摘要
具有Attosond脉冲序列的原子的电离导致与发射光电子纠缠的激发离子状态。尽管如此，离子集合仍然保留了可以通过激光参数控制的连贯性。在氦气中，控制$ 2s/2p $ he $^+$连贯性的控制是由$ n = 2 $阈值的自动化状态介导的[phys。 Rev. Res。 {\ bf 3}，023233（2021）]。在目前的工作中，我们研究了$ n = 3 $ n = 3 $ he $^+$ ion的$ n = 3 $阈值的共鸣的作用，在氦气原子的attosecond泵浦探针离子化中，我们使用newstock \ emph \ emph {ab ab initio}代码对其进行了模拟。由于n = 3 he $^+$级别的精细结构分裂，因此离子偶极子在picsecond时尺度上跳动。我们展示了如何从偶极子跳动中重建离子在其成立时的极化。
The ionization of atoms with sequences of attosecond pulses gives rise to excited ionic states that are entangled with the emitted photoelectron. Still, the ionic ensemble preserves some coherence that can be controlled through the laser parameters. In helium, control of the $2s/2p$ He$^+$ coherence is mediated by the autoionizing states below the $N=2$ threshold [Phys. Rev. Res. {\bf 3}, 023233 (2021)]. In the present work we study the role of the resonances both below and above the $N=3$ threshold on the coherence of the $N=3$ He$^+$ ion, in the attosecond pump-probe ionization of the helium atom, which we simulate using the newstock \emph{ab initio} code. Due to the fine-structure splitting of the N=3 He$^+$ level, the ionic dipole beats on a picosecond timescale. We show how, from the dipole beating, it is possible to reconstruct the polarization of the ion at its inception.
